168 PEOF. O. T. JO]S'ES OX [vol. IxxTii, 



etc., and is atti-ibiited to the Llandoveiy Group. The shales with 

 ihe calcareous bands assigned to the Woolhope Limestone 3delded 

 lllcenus harriensis, Homalonotus delpliinoce])}ialus, Spirifer 

 elevatus, SiropJieodoytta imhrex^ ^cliuclierteUa pecien, Vlectam- 

 honites trans versa /is, WiJsonia wihoiii, etc. Two of these forms 

 .are common to the limestone of the Old Radnor district, and the 

 whole aspect of the fauna is AVenljckian. The systematic position 

 of the shales Avith calcareous Hags and the overlying earthy lime- 

 :stone is not clear from Murchison's description. He apparently 

 regarded them as passage-beds from the Upper Llandovery into 

 the Woolhope. Their chief interest is in the occurrence of the 

 well-marked species ^tricMandiuia Jirata (forma tyjDica), which 

 appears to be of very restricted vertical range. As there is no 

 information in regard to the fauna associated with that species, it 

 is impossible to decide whether the horizon should be attached to 

 the Woolhope or to the Llandovery (see Marloes Bay, below). 



In the Malvern area J. Phillips ^ describes the gradual passage 

 from the L'pper Llandoveiy rocks, with the usual fauna, into a 

 group of shales with calcareous beds containing a somewhat dif- 

 ferent fauna, amono- which the followins: forms suo-o-est Wenlock 

 .affinities: — Anasiropliia deJJejoa, Spirifer crispvs, and Afrypa 

 reticular is, ^^YAinquif era. Stricklandiuia Urata is not recorded. 



(2) Hie Stroplieodonta compressa or Southern Sub-Facies. 



This is exhibited in the Marloes-Wooltack area, Tortworth, and 

 the Mendips. 



As the relation of the Yalentian to the succeeding rocks is 

 clearly displayed in the former ai-ea, it will be referred to first. 

 These sections are fully described in the Geological Survey 

 Memoir.^ The undoubted A'alentian rocks are associated Avith 

 contemporaneous volcanic products, and are distinguished by the 

 abundance of Stroplieodonta comptressa, Coelospira liemisplierica. 

 and Rhynchonellids, together with JSIeristina furcafa and Atriipa 

 reticularis, all of which are Upper Yalentian forms. The occur- 

 rence of Fhacops stokesi or a closely-allied form suggests a high 

 horizon in the series, that species being more especially charac- 

 teristic of the Wenlock Series. 



These are succeeded at Wooltack by relatively-barren green and 

 red grits and shales, with some appearance of unconformity at the 

 base of the red grits. They are overlain by mudstones with a 

 highh^'-distinctive fauna: Falceoci/clus a^., JBarrandella (jlohosa, 

 Sfricklandinia Urata (forma typica), Spirifer radiatus, and 

 Atrijpa reticularis being extraordinarily abundant, and the 

 assemblage appears to denote a high horizon in the Yalentian. 

 The StricMandinia is indeed identical Avith the form AAdiich occurs 

 . at the base of the AYoolhope Limestone of Woolhope. 



1 Mem. Geol. Siirv. vol. ii (1848) pt. 1, p. 73. 



- ' Geology of the South Wales Coalfield : Part XII— Milford ' Meir. Geol. 

 ;Surv. 1916, pp. 51-77. 



